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RESEARCH PAPERS

Mixed-Fuels Fuel Cell Running on Methane-Air Mixture

[+] Author and Article Information
Sung Pil Yoon1

Fuel Cell Research Center,  Korea Institute of Science and Technology, Seoul 136-791, South Korea

Hyun Jae Kim, Byung-Tak Park, Suk Woo Nam, Jonghee Han, Tae-Hoon Lim, Seong-Ahn Hong

Fuel Cell Research Center,  Korea Institute of Science and Technology, Seoul 136-791, South Korea

1

To whom correspondence should be addressed.

J. Fuel Cell Sci. Technol 3(1), 83-86 (Aug 23, 2005) (4 pages) doi:10.1115/1.2134741 History: Received July 24, 2005; Revised August 23, 2005

In order to develop solid oxide fuel cells (SOFCs) running on hydrocarbon fuels, we have focused on a new method of improving electrode performance and reducing carbon deposition by coating thin films of samaria-doped ceria (SDC) within the pores of electrode by a sol-gel coating technique. The SDC coating on the pores of anode made it possible to have a good stability for long-term operation due to low carbon deposition and nickel sintering. In this study, we demonstrated a new method of improving electrode performance and reducing carbon deposition by coating thin films of samaria-doped ceria and applied the modification technique to two different types of fuel cell structures, anode-supported SOFC and comb-shaped SOFC. From our results, the maximum power density of an anode-supported cell (electrolyte; 8 mol% YSZ and thickness of 30μm, and cathode; La0.85Sr0.15MnO3) with the modified anode was 300mWcm2 at 700°C in the mixture of methane (25%) and air (75%) as the fuel, and air as the oxidant. The cell was operated for 500hr without significant degradation of cell performance. For the comb-shaped SOFCs operated in the mixed-fuels fuel cell conditions, the cell performance was 40mWcm2 at 700°C in the CH4O2 ratio of 1.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

SEM image of anode-supported SOFC

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Figure 2

Schematic illustration of comb-shaped SOFC

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Figure 3

Compositions of the outlet gases from anodes measured at 700°C with the mixture of methane (25%) and air (75%) as the fuel under open-circuit conditions (anode-supported SOFCs)

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Figure 4

Performance of an anode-supported SOFC operated in the condition of partial oxidation of methane at the anode

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Figure 5

OCV variations in different gap NI(SDC)∕SDC∕LSM and Ni(SDC)∕YSZ∕LSM cells

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Figure 6

I-V characteristics of the Ni-SDC∕SDC∕LSM fuel cell operated at 550–700°C in MFFC condition: methane, oxygen, and nitrogen rates were 50, 50, and 100ml∕min [STP], respectively

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